Balkanization isn’t a master plan of any thinker, it’s a natural process as people move to cut themselves off from those they strongly disagree with.
I think there is a strong argument to be made that Balkanization is the ultimate, if unintended, result of the US founding fathers’ plan. From the very beginning it was a deal with the devil: a compromise between factions — who ought to be bitter enemies — under threat from a superior foe (the British Empire).
The collapse really began to build steam after the last great foe, the Soviet Union, was defeated.
That works great for regular guys. Not so great for the evil psychopaths who just don’t care what we try to teach them and will always be looking for people to victimize.